Cement-mixer.



No. 703,103. VPATENTE) P01121, 1905.

CEMENT MIXER.

APPLIOATION `ML110 MAY 12, 1004.

wlmfssfs.- E /m/E/vrofr waak, M M7 JJM y f/w ATTHNEYS UNiTnn STATESPatented February 21, 1905.

PATENT OFFICE.

CEMENT-MIXER.

SPECIFICATION forming part of Letters Patent No. 783,103, dated February21, 1905.

Application filed May 12, 1904. Serial. No. 207,592.

To all whom, t may concern.'

Be it known that I, ROBERT B. OoL'rRrN,aciti .Zen of the United States,residing at Jackson, in the county of Jackson and State ofiVIichi-A gan,have invented certain new and useful Improvements in Cement-Mixers; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it ap- The principal objects are, first, to provide animproved mixing-receptacle and coperating mixer by which the ingredientsto be incorporated are thoroughly mixed and at the same time graduallyworked and conveyed from the inlet toward the discharge end of thereceptacle, the latter being horizontally disposed; second, to supportthe receptacle so as to avoid clogging of the material or any objectbetween the mixing-blades and the interior walls of the receptacle, and,third, to produce an eiiicient and convenient machine whereby theingredients can be fed as desired into one end of the receptacle,rapidly and effectively mixed, saturated to proper consistency whilemixing, and conveyed and discharged into a suitable receptacle at theopposite end or into a spreader for distributing the composition, as inlaying' cement and concrete. l

In the accompanying drawings, which form a part of this specification,the invention is illustrated embodied in a portable cement or concretemixer adapted for spreading or laying the materialas it is produced. Theinvention is, however, not confined to this or any specific embodiment,but is susceptible of general utility for mixing ingredients of variouskinds of stock, compositions, or products, and the illustrated machineis of course construction illustrated the invention will first be fullydescribed with reference to the drawings and then more particularlypointed out and defined in the annexed claims.

In said drawings, Figure l represents a perspective view of amixing-machine embodying my invention. Fig. 2 is a detail perspective ofthe mixer, having spirally-twisted blades. Fig. 3 represents a plan ofthe conical receptacle in which the mixer rotates.

Referring to these drawings by specific reference-numerals, l representsthe main supporting-frame, mounted on side wheels 2 and the front medialguide-wheel 3, with a handle or tongue 4: attached to the shaft thereof.In the central part of the frame is a longitudinally and horizontallydisposed conical shell or mixing-receptacle 5 of semicircularcrosssection, suspended from theupper part of the frame by rods or bychains 6, attached to apertured lugs in the sides of the receptacle.

The larger end of this mixing receptacle or trough is disposed at theback of the machine and is .lower than the opposite smaller end. Sand,cement, gravel. crushed stone, or ashes or other desired materials areintroduced into the smaller end of the receptacle and are mixed and atthe same time gradually worked or conveyed by the revolving spiralblades of the mixer toward the larger end, from which they aredischarged. This mixing-receptacle may be made integrally or in parts,secured, as shown in Fig. 3, by the bolts 7 on the under side of thereceptacle. The lower end, which, as aforesaid, in this case is thelarger, is open and is preferably supplied with a spout 8 to conduct themixed material to the spreader 9. The opposite end may be partially orentirely closed to prevent the loose dry cement and sand from siftingout when first exposed tothe action of the agitator. By supporting orsuspending the receptacle loosely,as described, it is given a slightlateral play, which prevents clogging of the material. For instance, ifa stone should. accidentally be admitted with the sand between themixing-blades and sides of the receptacle the latter would movesu'fiiciently to allow the stone to pass out instead ofl bending orbreaking the blade, as would otherwise occur. The mixer, which revolvesclosely within said re- IOO . tacle.

ceptacle 5, is of conical form to correspond with the configuration ofsaid receptacle. As shown, itconsists of a central shaft 10, oppositeend plates 11 and 12 rigid therewith, and longitudinal mixing-.blades13, which connect the end plates. This mixer lits rotatably withinvthereceptacle 5, and its shaft 10 is journaled in suitable bearings at thefront and rear ends of the machine. Its blades or bars 13 are twisted orspiral, so that in revolving the front portions of the blades are inadvance of the rear portions, each blade thus passing into the materialin the receptacle progressively from its front to. its rear end. Byvirtue of the conical shape of the mixer and the twisted or spiralblades when the mixer revolves in the direction of the arrow in Fig. 2each revolving blade in addition to its mixing function scoops orscrapes up thev dry mass at the smaller end of the receptacle and at thesame timeI feeds it toward the larger end, .this action beingfacilitated also by the rearward downward inclination of the recep- Theblades or bars are preferably of steel and have bent terminals rivetedto the inner faces of the end plates 11 and 12, though they may beattached in any suitable manner. Thus it is seen that the mixer servesalso as a conveyer, and as the mass approaches the larger end of thereceptacle it is exposed toa regulated stream of water or liquid wherebyit becomes saturated to the proper consistency, the water being mixedtherewith by the blades, and its immediate discharge is prevented by thescooping effect of the inclined bars, and a final and thorough mixing isthereby produced.

Rigid with the mixer-shaft 10 and preferably on the outer side of thelarger end plate is a sprocket or pulley 14:, connected in a suitablemanner to the sprocket 15, whose shaft has a crank 16 or other means forrotating.

Above the mixing-receptacle are several chambers or boxes adapted tohold the ingredients necessary in mixing the concrete or composition andsupply the same to the mixing-chamber. In this case these boxes areshown mounted on the top of the frame. The numeral 17 denotes thewater-tank, having a regulating-cock 18 and conducting-pipe 19. Numerals2O and 21 indicate sand and cement boxes, both having lift-doors 22,operated by the projecting levers or handles 23, so that the amount andproportion may be properly regulated either in a continuous orintermittent stream falling into the common spout or hopper 24:, wherethey are partially mixed before reaching the mixing-tank proper. Morechambers may be added, if desired, placed either on top of themachine-frame or at the side or elsewhere, as desired, and provided withsuitable spouts for conducting the ingredients, whether crushed stone,cinders, or what not, into the mixing-receptacle.

From the foregoing description the operation of the mixer is obvious.Sand and cement or other ingredients are discharged, as'

D Worked gradually toward the larger end, where the water is added.After becoming saturated and worked to a proper consistency the plasticmass iiows out at the spout Sinto the bed or spreader 9.

If used in making concrete walks and the like, it is very convenient tohave the concrete spread and deposited in an even layer at the placesdesired, and this may be accomplished' eiciently by means of'my improvedmachine, which is pulled along to allow the composition to flow out andspread from the spreader 9.

I claim as my invention and desire to secure by Letters Patent of theUnited States- 1. In a mixing-machine of the character described, ahorizontally disposed conical trough, and a rotating mixer thereinhaving a conical contour corresponding to the interior shape of thetrough, said mixer comprising a shaft with rigid end plates constitutingthe end walls of the trough and connected by spiral or twisted bladesall disposed in the same conical surface.

2. A mixing-machine having, in combination, a frame, ahorizontally-disposed receptacle suitably su pported therein having itsbottom downwardly inclined, said receptacle being of parti-circularcross-section; a rotary mixer-working in said receptacle comprising' alongitudinally-disposed shaft suitably journaled in bearings in saidframe, end disks or circular plates rigid on said shaft and rotatal blyfitted in opposite ends of said receptacle and constituting its endwalls, a dischargespout at the lower end of said receptacle below thediskat that end, and mixing-blades rigidly connecting said disks andcooperating with theinterior ofsaid receptacle; and means for rotatingsaid mixer.

3. A mixing-machine having, in combination, a conical troughy orreceptacle horizontally disposed with its bottom downwardly inclinedtoward its large end, and a correspondingly-shaped rotary mixer workingtherein having longitudinal spiral or twisted mixing- 'bladescooperating with the interior of said IOO IIO

the machine, a rotary mixer working in said trough,ingredient-chambersabove said trough adapted to discharge thereinto, and a spreader locatedbeneath the lower discharge end of the trough for\ receiving andspreading the admixture as the wheeled frame is moved along. Intestimony whereof I aHix my signature n presence of two witnesses.

ROBERT B. COLTRIN. Witnesses:

W. H. PITCHER, WILLIAM D. WHEAT.

